Testing-machine.



S. P. THACHER.

TESTING MACHINE.

APPLICATION FILED JUNE?. Isls.

1,288,746. Patented Dec. 24,1918.

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nacion or RHODE istanza.

COMPANY, A COR?? Specification of Letters Entert.

Application filed .Tune 7,1916. Serial No. 102,120.

T all vwhom t may concern:

a citizen of the United States. residing at compounds YVcehawken, county of Hudson, and State of New Jersey, have invented certain new and useful Tinprovements in Tcstingdlia chinesfof which the followingy is a full,

clear, and exact description.

invention relates to machines for plastics, more particularly rubber of?. that general type adapted for use in the manufacture of tires.

An object of the 4invention is to provide apparatus for testing? the material under conditions approximating 'service conditions, and to attain this end employs means for alternately compressing.,r and permitting expansion of the material., to cause it to take a permanent set under internal vheat conditions, etc., approximately the saine as pro-- duced in a tire in service.

The invention can be readily understood from the followingI description taken in connection with the a cconapanyine drawing' in which Figure 1 isa front elevation of the apparatus with a part broken away.

l is a side elevation of the9 parts This testing Fig: a shown in Fie; 1.. A

Referring,A new to the drawing in which like characters o' reference designate similar parts, the apparatus is shown to coinprise a frame including an. upper bar'10, an intermediate bar 11, and a lower bar '12, all connected by tierods 13. The VJframe is supported upon a bracket 14 which is bolted or otherwise secured to a post 15, or other suitable support. The tie-rods`13, in. the present embodiment, are equipped with bearings 16 in which is mounted a shaft if? that equipped at one end with a driving pulley 18 and at the other end 'with a balance wheel 19. A friction brake Z0 is mounted to contact with the balance wheel to stop the machine after the power is 'thrown olf.

There are two sets ot testing; devices shown inthe present embodiment, and as each is a duplicate of the other, but one will be described. Each device comprises a pair of members 21 and 2'3 between which the material to be tested, preferably in'the shape ol a ball Q3. as shown, is supported at opposite points. The lower member 21 is provi/lcd, with a stem '2l which passes through a bearing 2:3 carried by the frame and bears upon the cdfrc ot a c is fixed to the shaft l?.

22 is equipped with a stem 27 ASSGNOR TO REVERE RUBBER 'Patented lice. 2d, Tlil.

ain 2G which The upper member which is in vertical alinenilenl with the stein 2l oi the lower member. and is threaded into a piston which works in an air c vlii'idcr 29 carried bythe trame. A vpipe Cl() si ippl ies coinpressed air to `the cylinder on top of the piston, the air pressure within beine' controlled b v a valve rl`hc stem 27 provided with wound a cord over pulleys 34.- post 15, and being' a spool 32 up 233, the cord the cylinder 31 in the pipe. of the upper member is on which is being trained and'l supported upon the` terminally equipped with a eight 36 which tends to unwind the cord oil thc spool with resultant the stem 27 out o' its socket in the permanent set in the rubber presently appear.

ln operation, the ball rotation ol to advance the threaded stem piston to take up ball as will ot" stock to be tested is placed between the members 21 and 22, these members being initially positioned so that the stero ol" the lower member hears upon the low .side oli the cam member pressing it. sure is now let chine is then Q6, and the touches the ball without com- .fiir under any desired presinto the cylinder. The mastartcd whereupon the cam alternately raises and permits gravitation of the member 21 so that the rubber ball 1s alternately compressed against 22 and )crnutted to ex iand to n the member ormai condition, whereby vinternal heat condition, disintegration, etc., will be set up in. similar to that produced in actu By u luder, any desired load the ball while it instance, suppose that it is des press the hall under a pounds. inches, then pounds may be of 250 pounds. the

the member Q1, so

."arylng` vthe au:l .pressure the material al service.

in the cylplaced upon being compressed. YFor ired to compressure of 250 it thil piston arca is 10 square air pressure nuist be to the cylinder. When the hall is comed as much as possible' under this prespiston will recede that a pressure ot 250 pounds on the ball is not exceeded at any moment. of the compression stroke ol" the memberV 2l.

:ls is woll known to those working in the ari. the ball olt rubber stock wi lafter compression to its' initial t ll not return hickness. but

will settle and fail to return to its initial thickness by a small increment, and this increment is known as the permanent set taken bythe material. After each increment settling of the material, the member 22 is unscrewed from the piston 28 by the Weight 36 acting upon the cord 33, and' is moved downwardly suiciently to contact With the material. Thus the member 22 is constantly maintained in intimate contact With the material. After the machine has been oper ating for a desired period, it is stopped and the permanent set taken by the material, under the infiuence of the ot' the members 21 and 22, acting vthrough the known period of time, maybe measured by calipers, or otherwise. I

Having thus described my invention, what I claim as newfand desire to protect by. Let- 1ers Patent is:

1. A testing machine comprising a pair of pressu` e applying members, means for rela-A tively" moving ysaid members to and from cach otlier4 for Acoinpressing the stock to. be tested, `fiuid.. orf. yIyative means for regulating the load app .edto the stock by said members, and means for adjusting one of said members to provide for the permanent set of said stock.

2. Ina lfestino machine a pair of pressure applying members, means for relatively known pressureyof the moving said members to. and from eacn other for compressing the stock to be tested, and means for automatically adjusting one of said members to provide forthe permanent set of said stock. 1

3. In a testingfmaehine a pair of pressure applying members, means for relatively moving said members to and from each other for compressin the stock to be tested, means 40 for automatical f adjusting one of said members to provide for the permanent set. of` said stock, and a pressure regulating means.

4. A testing machine comprising members adapted to support the mate-rial to be tested, means for actuating one of the members to alternately compress and permit expansion material, and means for exerting pneumatic pressure on the other member.

A testing machine comprising members adapted to support the material to be tested, p means for actuating one of the members to` alternately compress and permit expansion of the material, means for exerting pneumatic pressure .on the other member, and? means independent of said pressure means for moving said( other member into contact with the materia-l after increment settling of the material.v

Signed at New York, New York, this 6th 60 day of June, 1916.

SHELDON P. THACHER. 

